The thing is, Slivers arent actually all that popular in Commander circles, with just 800 decks or so registering the card
Pikachu ex's Circle Circuit attack only deals damage for every Electric-type Pokmon on the bench, which means that Mew ex can't replicate its attack strength
However, as the game developed and players learned that life points don't matter until they hit zero, Solemn Judgment saw a large increase in playability
With just a few bucks, they let you invest in collectibles like trading cards, sports memorabilia, and fine wine
But an important thing to remember is to add cards like "Ultimate Offering", "Double Summon", and "Mausoleum of the Emperor", to maintain field advantage, because if you can't keep a couple of monsters on the field all you will have is a bunch of useless stuff
As a result, in buying Invent Superiority, you have a ton of different possibilities for upgrading and changing your deck